1/3×5+1/5×7+1/7×9.+1/2011×2013

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1/3×5+1/5×7+1/7×9.+1/2011×2013
Peasa快点,明天要交

1/3×5+1/5×7+1/7×9.+1/2011×2013
=1/2[(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+……+(1/2011-1/2013)]
=1/2(1/3-1/2013)
=1/2*670/2013
=335/2013

1/1×3+1/3×5+1/5×7+1/7×9.+1/2011×2013 1/3×5+1/5×7+1/7×9.+1/2011×2013 1+3+5+7+9+.+2011+2013 1+2+3+4+5+6+7+8+9.+2011+2012+2013等于多少请问1+3+5+7+9.+2013怎么算 1+3+5+7+9.+2011等于多少 1/1*3+1/3*5+1/5*7+1/7*9+.1/2009*2011+1/2011*2013 等于多少? 1/1+3+1/+3×5+1/5×7+.+1/2011×2013 (1×3)分之1+(3×5)分之1+(5×7)分之1+...+(2011×2013)分之1, 1/1*3*5+1/3*5*7+1/5*7*9.+1/95*97*99 1-3+5-7+9.+97-99 -1+3-5+7-9.-97+99